"Thus a BFR can be a meter or two off, and it is much less of a miss for a 9 meter wide vehicle, than for a 3 meter wide vehicle. I.e. More room for error in accuracy on a larger vehicle. " Care to expand on that? How is missing the launch mount by a meter OK just because the vehicle is bigger?
– Organic MarbleMay 16 at 0:27

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@OrganicMarble Good point. I think this is essentially my second question How would a launch mount have to be modified in order to support landing rocket boosters?
– Everyday AstronautMay 17 at 20:46